Unit 2217: Plant Physiology and Crop Science

1. Plant Growth and Development

1.1 Overview of Plant Growth

• Definition and stages: cell division, differentiation, maturation
• Meristematic tissues and their role

1.2 Cell Division and Differentiation

• Mitosis and its significance
• Differentiation processes leading to specialized tissues

1.3 Factors Influencing Plant Growth

• Light: intensity, duration, quality
• Temperature: optimal ranges, effects of extremes
• Water availability and its role
• Nutrients: macro and micronutrients

2. Photosynthesis and Respiration in Crops

2.1 Photosynthesis Mechanism

• Light-dependent reactions: chlorophyll, photosystems I & II
• Light-independent reactions: Calvin Cycle
• Factors affecting photosynthesis

2.2 Respiration in Plants

• Aerobic respiration: glycolysis, Krebs cycle, electron transport chain
• Role of respiration in energy release and growth
• Differences between photosynthesis and respiration

3. Transpiration and Water Use Efficiency

3.1 Transpiration Process

• Structure of stomata and regulation
• Factors influencing transpiration rate

3.2 Water Use Efficiency (WUE)

• Definition and importance
• Measuring WUE: biomass produced per unit water transpired

3.3 Strategies to Improve WUE

• Breeding and genetic approaches
• Agronomic practices: mulching, irrigation methods

4. Nutrient Uptake and Plant Nutrition

4.1 Nutrient Uptake Mechanisms

• Root absorption processes: active and passive transport
• Mycorrhizal associations

4.2 Essential Nutrients and Functions

• Macronutrients: N, P, K, Ca, Mg, S
• Micronutrients: Fe, Mn, Zn, Cu, Mo, B, Cl

4.3 Nutrient Deficiency Symptoms

• Identifying common deficiency symptoms
• Impact on growth and yield

4.4 Optimizing Nutrient Uptake

• Soil fertility management
• Fertilizer types and application methods

5. Hormonal Regulation in Plants

5.1 Types of Plant Hormones

• Auxins, Gibberellins, Cytokinins, Ethylene, Abscisic Acid

5.2 Hormonal Functions

• Seed germination, root and shoot growth
• Flowering and fruit development

5.3 Hormone Interactions and Signaling

• Synergistic and antagonistic effects
• Signal transduction pathways

6. Environmental Stress Responses in Crops

6.1 Types of Environmental Stresses

• Drought, salinity, heat, cold

6.2 Physiological and Biochemical Mechanisms

• Osmotic adjustment and compatible solutes
• Antioxidant defense systems: enzymes and molecules
• Stress signaling pathways and gene expression

6.3 Adaptation and Tolerance Strategies

• Breeding for stress tolerance
• Agronomic management to mitigate stress

7. Crop Yield and Quality

7.1 Factors Influencing Crop Yield

• Genetic potential and varietal characteristics
• Environmental conditions: soil, climate
• Management practices: planting density, fertilization

7.2 Crop Quality Parameters

• Nutritional content
• Physical and sensory attributes

7.3 Enhancing Yield and Quality

• Improved cultivation techniques
• Post-harvest handling and storage